sata: ahci-da850: get the sata clock using a connection id (82dbe1a6) · Commits · 戴 / test

In preparation for using two clocks in the driver (the sysclk2-based clock and the external REFCLK), check if we got the functional clock after calling ahci_platform_get_resources(). If not, retry calling clk_get() with con_id specified. Signed-off-by:

Bartosz Golaszewski <bgolaszewski@baylibre.com> Acked-by:

Tejun Heo <tj@kernel.org> Signed-off-by:

Sekhar Nori <nsekhar@ti.com>

drivers/ata/ahci_da850.c

+16 −0

Original line number	Diff line number	Diff line
		@@ -71,12 +71,28 @@ static int ahci_da850_probe(struct platform_device *pdev)
		struct ahci_host_priv *hpriv;
		struct resource *res;
		void __iomem *pwrdn_reg;
		struct clk *clk;
		int rc;

		hpriv = ahci_platform_get_resources(pdev);
		if (IS_ERR(hpriv))
		return PTR_ERR(hpriv);

		/*
		* Internally ahci_platform_get_resources() calls clk_get(dev, NULL)
		* when trying to obtain the functional clock. This SATA controller
		* uses two clocks for which we specify two connection ids. If we don't
		* have the functional clock at this point - call clk_get() again with
		* con_id = "fck".
		*/
		if (!hpriv->clks[0]) {
		clk = clk_get(dev, "fck");
		if (IS_ERR(clk))
		return PTR_ERR(clk);

		hpriv->clks[0] = clk;
		}

		rc = ahci_platform_enable_resources(hpriv);
		if (rc)
		return rc;

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